- Put the lard to melt in a glass bowl (I used to stick it on top of the rayburn when I had one) - Add the caustic soda to the cold water (GENTLY! And never the other way round) - Once the water is clear again, add it slowly to the melted lard, mixing with a hand-blender with a towel over the top to stop it splashing - When it's going gloopy and you can see the path of the blender in it ('tracing'), pour it in to your mold - Keep it as warm as you can for a few hours to help the caustic soda/fat reaction continue - Leave for six weeks somewhere where air can circulate round it - eg in a tea towel in the airing cupboard - Slice and use - Or, grate, add a bit of water and some petals/essential oils and wodge in to the mold again to set for a few days before slicingWear eye protection, rubber gloves and an apron - be careful, caustic soda is grim stuff. This makes a very nice soft, basic soap.